inc folder contains all the source.
Check out example folder with samples on how to use particular functions / classes.
=== PHP Functions ==
inc/pbs_get_redirected_url.php =>
Function returns url of a website that visitors are redirected to via HTTP redirects.
Example: pbs_get_redirected_url("http://goo.gl/g7jRb") would return "https://bitbucket.org/pbarkans/php-helper-functions-and-classes".
inc/pbs_make_valid_url.php =>
Makes something like "beautiful-url-seperated-by-dashes" from "Beautiful URL seperated by Dashes£$%^&*()".
Mostly can be used for creating seo-style urls.